Java Coding Problems

117. Merging two maps

Merging two maps is the process of joining two maps into a single map that contains the elements of both maps. Furthermore, for key collisions, we incorporate in the final map the value belonging to the second map. But this is a design decision.

Let's consider the following two maps (we intentionally added a collision for key 3):

public class Melon {  private final String type;  private final int weight;  // constructor, getters, equals(), hashCode(),  // toString() omitted for brevity}Map<Integer, Melon> melons1 = new HashMap<>();Map<Integer, Melon> melons2 = new HashMap<>();melons1.put(1, new Melon("Apollo", 3000));melons1.put(2, new Melon("Jade Dew", 3500));melons1.put(3, new Melon("Cantaloupe", 1500));melons2.put(3, ...